Code P1000 why won’t my car start?

Hello, P1000 means that there is not enough data since the last "clear" of diagnostic trouble codes -- completed either with a diagnostic tool or from loss of battery power. So, it means nothing about a 'no start' situation. You've replaced too many parts without testing, apparently. Hands on testing is needed to find out what's going on with your no start. "Loud noise" and "terrible scratchy knocking noise" sounds a bit negative -- like perhaps an internal engine concern has occurred and maybe your engine will not crank. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops